During a September rally, which has caught a lot of investors off guard, bullish sentiment rallied hand in hand with the stock market. However, even as the S&P 500 and all the major averages rallied to record highs in the wake of the Fed's announcement on Wednesday, bulls took a breather.

According to the weekly survey from theAmerican Association of Individual Investors (AAII), bullish sentiment declined slightly from last week, falling from 45.5% down to 45.11%. In the grand scheme of things, it's more of a rounding error than anything else, but it did break a streak of three straight weeks where bullish sentiment increased.